Shell Programming and Scripting

new-10.txt
new-11.txt
new-12.txt
new-13.txt
new-14.txt
new-15.txt
new-16.txt
new-17.txt
new-18.txt
new-19.txt
new-1.txt
new-20.txt
new-21.txt
new-22.txt
new-23.txt
new-24.txt
new-25.txt
new-26.txt
new-27.txt
new-28.txt
new-29.txt
new-2.txt

awk 'NR==1 || $'$my_col'<p{close(f); f="'$name'-"++i".txt"}{print>f; p=$'$my_col'}' $file

new-1.txt
new-2.txt
new-3.txt
new-4.txt
new-5.txt
new-6.txt
new-7.txt

sort -t"-" -k2n,2